Simulations of Feature-Driven Jets in an HED Environment

In the context of ICF, material jets due to the presence of features (such as divots) at the inner or outer surface of material shells may contribute to yield loss during capsule implosion. However, simulating capsules with such features inherently calls for 3D geometries and greatly increases computational expense. This work investigates the jetting mechanisms from prescribed initial divot shapes such as hemispheres and cones and their interaction with additional layers, in order to determine the resolution needed to capture relevant mixing dynamics. Two dimensional simulations of a heavy to-light interface (plastic-foam) using xRAGE are performed and compared to an on-going LANL experimental campaign on OMEGA-EP. The simulations leverage the use of a laser model to simulate the initial laser-driven shock and the late-time rarefaction from laser turn-off. Multiple configurations are considered: divot size (between 50 μm and 350 μm), foam-filled vs. air-filled divots, as well as single vs. double divot and their self-induced interaction.